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Dive into the research topics where H. Andersson is active.

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Featured researches published by H. Andersson.


Nature | 2007

The loss of ions from Venus through the plasma wake

Sergey Vasilyevich Barabash; A. Fedorov; J. J. Sauvaud; R. Lundin; C. T. Russell; Yoshifumi Futaana; T. L. Zhang; H. Andersson; K. Brinkfeldt; Alexander Grigoriev; M. Holmström; M. Yamauchi; Kazushi Asamura; W. Baumjohann; H. Lammer; A. J. Coates; D. O. Kataria; D. R. Linder; C. C. Curtis; K. C. Hsieh; Bill R. Sandel; M. Grande; H. Gunell; H. Koskinen; E. Kallio; P. Riihela; T. Sales; W. Schmidt; Janet U. Kozyra; N. Krupp

Venus, unlike Earth, is an extremely dry planet although both began with similar masses, distances from the Sun, and presumably water inventories. The high deuterium-to-hydrogen ratio in the venusian atmosphere relative to Earth’s also indicates that the atmosphere has undergone significantly different evolution over the age of the Solar System. Present-day thermal escape is low for all atmospheric species. However, hydrogen can escape by means of collisions with hot atoms from ionospheric photochemistry, and although the bulk of O and O2 are gravitationally bound, heavy ions have been observed to escape through interaction with the solar wind. Nevertheless, their relative rates of escape, spatial distribution, and composition could not be determined from these previous measurements. Here we report Venus Express measurements showing that the dominant escaping ions are O+, He+ and H+. The escaping ions leave Venus through the plasma sheet (a central portion of the plasma wake) and in a boundary layer of the induced magnetosphere. The escape rate ratios are Q(H+)/Q(O+) = 1.9; Q(He+)/Q(O+) = 0.07. The first of these implies that the escape of H+ and O+, together with the estimated escape of neutral hydrogen and oxygen, currently takes place near the stoichometric ratio corresponding to water.


Icarus | 2006

Carbon dioxide photoelectron energy peaks at Mars

R. A. Frahm; J. D. Winningham; J. R. Sharber; J. R. Scherrer; S.J. Jeffers; A. J. Coates; D. R. Linder; D. O. Kataria; R. Lundin; Stas Barabash; M. Holmström; H. Andersson; M. Yamauchi; A. Grigoriev; E. Kallio; T. Sales; P. Riihela; W. Schmidt; H. Koskinen; Janet U. Kozyra; J. G. Luhmann; Edmond C. Roelof; D. J. Williams; S. Livi; C. C. Curtis; K. C. Hsieh; Bill R. Sandel; M. Grande; M. Carter; Jean-André Sauvaud


Icarus | 2006

Electron oscillations in the induced martian magnetosphere

J. D. Winningham; R. A. Frahm; J. R. Sharber; A. J. Coates; D. R. Linder; Y. Soobiah; E. Kallio; J. R. Espley; R. Lundin; Stas Barabash; M. Holmström; H. Andersson; M. Yamauchi; A. Grigoriev; J. R. Scherrer; S.J. Jeffers; D. O. Kataria; Janet U. Kozyra; J. G. Luhmann; Edmond C. Roelof; D. J. Williams; S. Livi; C. C. Curtis; K. C. Hsieh; Bill R. Sandel; H. Koskinen; T. Sales; P. Riihela; W. Schmidt; M. Grande


Icarus | 2006

Ionospheric plasma acceleration at Mars: ASPERA-3 results

R. Lundin; D. Winningham; Stas Barabash; R. A. Frahm; H. Andersson; M. Holmström; A. Grigoriev; M. Yamauchi; H. Borg; J. R. Sharber; Jean-André Sauvaud; A. Fedorov; E. Budnik; J. J. Thocaven; Kazushi Asamura; H. Hayakawa; A. J. Coates; D. R. Linder; D. O. Kataria; C. C. Curtis; K. C. Hsieh; Bill R. Sandel; M. Grande; M. Carter; D. H. Reading; H. Koskinen; E. Kallio; P. Riihela; W. Schmidt; T. Sales


Planetary and Space Science | 2008

Comparative analysis of Venus and Mars magnetotails

A. Fedorov; C. Ferrier; Jean-André Sauvaud; Stas Barabash; T. L. Zhang; C. Mazelle; R. Lundin; H. Gunell; H. Andersson; K. Brinkfeldt; Yoshifumi Futaana; Alexander Grigoriev; M. Holmström; M. Yamauchi; Kazushi Asamura; W. Baumjohann; H. Lammer; A. J. Coates; D. O. Kataria; D. R. Linder; C. C. Curtis; K. C. Hsieh; Bill R. Sandel; J. J. Thocaven; M. Grande; H. Koskinen; E. Kallio; T. Sales; W. Schmidt; P. Riihela


Icarus | 2006

Numerical interpretation of high-altitude photoelectron observations

Michael W. Liemohn; R. A. Frahm; J. D. Winningham; Y. Ma; Stas Barabash; R. Lundin; Janet U. Kozyra; Andrew F. Nagy; S.M. Bougher; J. Bell; D. A. Brain; D. L. Mitchell; J. G. Luhmann; M. Holmström; H. Andersson; M. Yamauchi; A. Grigoriev; S. McKenna-Lawler; J. R. Sharber; J. R. Scherrer; S.J. Jeffers; A. J. Coates; D. R. Linder; D. O. Kataria; E. Kallio; H. Koskinen; T. Sales; P. Riihela; W. Schmidt; Edmond C. Roelof


Planetary and Space Science | 2008

Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS

A. J. Coates; R. A. Frahm; D. R. Linder; D. O. Kataria; Y. Soobiah; Glyn Collinson; J. R. Sharber; J. D. Winningham; S.J. Jeffers; Sergey Vasilyevich Barabash; Jean-André Sauvaud; R. Lundin; M. Holmström; Yoshifumi Futaana; M. Yamauchi; Alexander Grigoriev; H. Andersson; H. Gunell; A. Fedorov; J. J. Thocaven; T. L. Zhang; W. Baumjohann; E. Kallio; H. Koskinen; Janet U. Kozyra; Michael W. Liemohn; Yibo Ma; André Galli; Peter Wurz; P. Bochsler


Icarus | 2006

First ENA observations at Mars: Subsolar ENA jet

Yoshifumi Futaana; Stas Barabash; A. Grigoriev; M. Holmstrom; E. Kallio; Pontus C Son Brandt; H. Gunell; K. Brinkfeldt; R. Lundin; H. Andersson; M. Yamauchi; S. McKenna-Lawler; J. D. Winningham; R. A. Frahm; J. R. Sharber; J. R. Scherrer; A. J. Coates; D. R. Linder; D. O. Kataria; T. Sales; P. Riihela; W. Schmidt; H. Koskinen; Janet U. Kozyra; J. G. Luhmann; E. Roelof; D. Williams; S. Livi; C. C. Curtis; K. C. Hsieh


Icarus | 2006

First ENA observations at Mars: Charge exchange ENAs produced in the magnetosheath

H. Gunell; K. Brinkfeldt; M. Holmström; Pontus C Son Brandt; Stas Barabash; E. Kallio; A. Ekenback; Yoshifumi Futaana; R. Lundin; H. Andersson; M. Yamauchi; A. Grigoriev; J. D. Winningham; R. A. Frahm; J. R. Sharber; J. R. Scherrer; A. J. Coates; D. R. Linder; D. O. Kataria; T. Sales; P. Riihela; W. Schmidt; H. Koskinen; Janet U. Kozyra; J. G. Luhmann; Edmond C. Roelof; D. J. Williams; S. Livi; C. C. Curtis; K. C. Hsieh


Icarus | 2006

First ENA observations at Mars: Solar-wind ENAs on the nightside

K. Brinkfeldt; H. Gunell; Pontus C Son Brandt; Stas Barabash; R. A. Frahm; J. D. Winningham; E. Kallio; M. Holmström; Yoshifumi Futaana; A. Ekenback; R. Lundin; H. Andersson; M. Yamauchi; A. Grigoriev; J. R. Sharber; J. R. Scherrer; A. J. Coates; D. R. Linder; D. O. Kataria; H. Koskinen; T. Sales; P. Riihela; W. Schmidt; Janet U. Kozyra; J. G. Luhmann; Edmond C. Roelof; D. J. Williams; S. Livi; C. C. Curtis; K. C. Hsieh

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R. Lundin

Swedish Institute of Space Physics

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A. J. Coates

University College London

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D. R. Linder

University College London

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H. Koskinen

Finnish Meteorological Institute

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D. O. Kataria

University College London

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